spark StreamHandle 源码
spark StreamHandle 代码
文件路径：/common/network-shuffle/src/main/java/org/apache/spark/network/shuffle/protocol/StreamHandle.java
/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.spark.network.shuffle.protocol;
import java.util.Objects;
import io.netty.buffer.ByteBuf;
import org.apache.commons.lang3.builder.ToStringBuilder;
import org.apache.commons.lang3.builder.ToStringStyle;
// Needed by ScalaDoc. See SPARK-7726
import static org.apache.spark.network.shuffle.protocol.BlockTransferMessage.Type;
/**
* Identifier for a fixed number of chunks to read from a stream created by an "open blocks"
* message. This is used by {@link org.apache.spark.network.shuffle.OneForOneBlockFetcher}.
*/
public class StreamHandle extends BlockTransferMessage {
public final long streamId;
public final int numChunks;
public StreamHandle(long streamId, int numChunks) {
this.streamId = streamId;
this.numChunks = numChunks;
}
@Override
protected Type type() { return Type.STREAM_HANDLE; }
@Override
public int hashCode() {
return Objects.hash(streamId, numChunks);
}
@Override
public String toString() {
return new ToStringBuilder(this, ToStringStyle.SHORT_PREFIX_STYLE)
.append("streamId", streamId)
.append("numChunks", numChunks)
.toString();
}
@Override
public boolean equals(Object other) {
if (other instanceof StreamHandle) {
StreamHandle o = (StreamHandle) other;
return Objects.equals(streamId, o.streamId)
&& Objects.equals(numChunks, o.numChunks);
}
return false;
}
@Override
public int encodedLength() {
return 8 + 4;
}
@Override
public void encode(ByteBuf buf) {
buf.writeLong(streamId);
buf.writeInt(numChunks);
}
public static StreamHandle decode(ByteBuf buf) {
long streamId = buf.readLong();
int numChunks = buf.readInt();
return new StreamHandle(streamId, numChunks);
}
}
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